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Original title in Czech: Silnoproudá elektrotechnika a elektroenergetikaFEKTAbbreviation: PP-SEEAcad. year: 2011/2012
Programme: Electrical Engineering and Communication
Length of Study: 4 years
Profile
The goal of the postgradual doctoral (PhD) study is the education for scientific work in the area of power electrical engineering and power systems. Graduates of PhD find occupation either as scientific or research workers including industrial development, either as universty teachers and in higher manager functions as well
Key learning outcomes
PhD-graduate obtains high theoretical knowledge and will learn to solve complicated scientific and technological problems by oneself PhD-graduate is ready for further professional rise with a high degree of adaptivity Graduates of PhD find occupation either as scientific or research workers including industrial development, either as universty teachers and in higher manager functions as well
Occupational profiles of graduates with examples
The graduate obtains broad knowledge of subject of high power engineering. The knowledge is build mainly on theoretical background of the subject. Moreover the graduate will obtain deep special knowledge aimed in direction of his/her thesis. The graduate will be able to perform scientific and/or applied research based on up to date theoretical knowledge. The graduate will be able to organize and lead a team of researchers in the studied subject.
Guarantor
doc. Dr. Ing. Miroslav Patočka
Issued topics of Doctoral Study Program
Regarding dynamic development of alternative power sources mutual cooperation of such sources is frequently aksed question nowadays. The aim of this disertation thesis is to design energy system compounded of more cooperating alternative power sources focusing on optimization of energy and economic balance. For veryfying hypothesis there is suggested usage of some simulation software and then compilation of physical analog.
Tutor: Mastný Petr, doc. Ing., Ph.D.
The results of evaluation of the supply reliability depends on the outage time. Present large networks are operated with the neutral grounded via resistor. The coming fault could cause non-neglectable outage larger than in networks earthed via compensating coil which is not recomended by standard. The main aim of the thesis is the verification ov the influence of the capacitive current of the network on the network safety and on the base of the results preparing of the proposal of the changes of the standard.
Tutor: Toman Petr, prof. Ing., Ph.D.
The work will be focused on elctromagnetic design optimization using artificial inteligence to get the best solution according to the desired requirements.
Tutor: Ondrůšek Čestmír, doc. Ing., CSc.
One of the issues in the lighting technology in recent years is the question of illuminance and luminance measurement in the outdoor environment in the long term, so-called monitoring. The issue is particularly joined with so-called "light pollution" phenomenon. As the technology for these purposes is not widely available, there arise a number of sub-issues to solve. Difficult issues are especially long-term measurements stability, automated data collection, autocalibration processes, processing of large sets of measurement, data processing in real-time, processing of image data from digital cameras for luminance analysis, etc. Within the thesis student could work, depend on availability of laboratory, on development measurement systems that are capable of long and accurate capture desired photometric quantities in outdoor environments, where it is necessary to count with influences such as temperature and humidity and exposure to extreme radiation - the solar spectrum, UV and IR radiation. Use of such devices are offered in the monitoring of sunshine and above-mentioned monitoring and obtrusive light.
Tutor: Baxant Petr, doc. Ing., Ph.D.
Aim of this work is research and development of a new type of DC machine with permanent magnet excitation. The machine would be used as multifunctional one with expansion of a new type of gear box. It is supposed a solution of magnetic circuit, magnetic field, induction in air gap of the machine, optimization by up-to-date numeric method (FEM), verification by analytical method, solution and total weight reduction of the machine, reduction of losses and increase of efficiency. Proposals and computations will be verified by measuring and tests made on samples and prototypes
Tutor: Hájek Vítězslav, prof. Ing., CSc.
Due to the rising trend in the use of biogas stations for energy supply, this work is to prepare complete conception focused on using waste energy generated during the biogas production. The task is to examine and provide options to optimize biogas stations production process by using mathematical models of thermal cycles and test these options in the practical operating conditions. Part of the proposed conception will also be economic evaluation of proposed options and study their usability in different operating conditions.
Calculation of simultaneous faults - short circuit and open conductors.
Tutor: Haluzík Evžen, doc. Ing., CSc.
The object of this work is to create a model of electrical substations (transformer station), which will be monitored and controlled by the central processing unit communicates directly with the process level station via Ethernet. In that model will be implemented basic monitoring functions for the individual branches in switchgears of the both voltage and control of switching elements in this branches using a blocking functions defined at station level. Based on the results of testing this model a centralized approach to control and monitoring of electrical substations will be reviewed with regard to the speed and quality of communication and the capability of currently used equipment.
Tutor: Orságová Jaroslava, doc. Ing., Ph.D.
Standard IEC 61850 defines the communication rules among equipments used in substations and requirements to each equipment which are connected. With the standard expansion to the number equipments that they will provide the acquaint data not only for inspection or protection function but also for further applications. Doctoral thesis will deal with usage these distributed data by IEC 61850 protocol.
The problem will be solved in cooperation with Siemens Electric Machines Drásov. It is supposed to find technical solution of fast deexcitation of a traction generator on main power generator terminals and not on the side of rotor between exciter armature and excitation winding of main generator. The task is to find out acceptable solution on the base of machines design and power electronic.
Fault protection of power systems is actual topic. In this time the utillities implement the digital communication according the standard IEC61850. A part of this process could be transfer of measured values from instrument transformers or sensors in digital form. The main aim of this tesis is development of protection function using input data in digital form and optimalization of this function in workload point of view of each element of the system.
The theme is focused on a specific area of today's advanced lighting systems and the use of dynamic lighting. The vast majority of today's lighting systems, artificial lighting is static, ie change its intensity, and if so, more on the wishes of the user - manual dimming. World global manufacturers of lighting equipment but already offer new intelligent lighting technologies, which involve the dynamic component to the lighting. It has been widely known that light affects human physiological functions through the biorhythms. These require a certain level of lighting and in particular a light-dark cycles in the day. But not only light intensity but also color or color temperature of light respectively affects the perception of human being and probably a psychological and possibly physiological point of view. In the thesis the student address precisely these questions based on research of the dynamic behavior of natural light sources and their simulations using artificial sources.
The principles currently used in the protective function of the digital protections are generally based on the evaluation of analog signals in current and voltage of the protected object. This input analog signals have been provided by instrument transformers from the origin of electrical protections. With the advent of sensors that are increasingly replaced the above conventional instrument transformers, is to be expected qualitatively and quantitatively different type of input signal to digital protection. With respect to this fact, may also be reviewed a number of protective functions, which the concept was based just on the cooperation with conventional current instrument transformers. This work should consider the influence of the used transducers (Rogowski coil or current transformer instrument) to a particular protective function and not only with regard to the parameterization, but also on the principles used to evaluate the fault states of protected system
The aim of the work is to develop independent source of electrical energy for measurement and data transmission from rotary elements. Primary energy sources may be of different physical origin.
This topic is focused to the examination of individual parts failures related to it's operation features.
Tutor: Veselka František, doc. Ing., CSc.
Ever-increasing share of renewable electricity to the connected system has some effect on the quality of electricity supplied to consumers (the size of voltage, frequency, harmonics, etc.). The work is to evaluate the current state methods for calculating the steady state of the network (suitable iterative method) to connect new sources and outline additional procedures and options in connection with the EU legislation, the rules for parallel operation of resources and energy flows in interconnected systems.
Tutor: Matoušek Antonín, doc. Ing., CSc.
Topic is focused on the LEDs spectro-radio-photometric parameters and characteristics research with regard to their colour rendering and change of the photometric parameters in luminaries for signalling and illuminating systems for railway applications. Aim of the project is proposal of a methodology for white LEDs colour rendering evaluation and determination of required LED parameters for illumination. Furthermore complex mechanical, electrical and optical design of luminaries for train’s external illuminating system with prototypes realization is expected. The problem is a part of research at Department of Electrical Power Engineering supported by the grant projects. Cooperation with Unicontrols-Tramex company is supposed. More information: drapela@feec.vutbr.cz.
Tutor: Drápela Jiří, prof. Ing., Ph.D.
Doctoral project is based on light water reactors' fuel elements behavior investigation and physical model aplication in abnormal operation and in severe accident conditions (i.e. LOCA, FA dry out, boiling crisis, and other transients). Student become familiar with various state-of-the-art computation methods and their application on present reactor systems and benchmark tasks. New physical and mathematical modules will be developed and tested.
Tutor: Katovský Karel, prof. Ing., Ph.D.
The project aims to develop a comprehensive theory of mathematical models of electric lamps, which can be used in the calculation of electrical networks, as well as calculations on the technical parameters of light illumination. Currently, there are a wide range of light sources, but their computer models are not known to have been adequately described and available for the current simulation and modeling programs, such as Dynasty and SIMULINK. These include Discharge lamps, which are relatively complicated dynamic system, whose model is based on knowledge of the theory of electric arc, thermodynamics, light engineering. Will be important in particular models discharge light sources that will address issues such as power control of resources, the emergence nonharmonic currents, interference effects of interharmonic components on light sources parameters, etc.
The topic is aimed at the analysis of present method for testing of insulation of devices for 110 kV and 22 kV distribution networks. The solver will deal with insulation testing methodology under electric stress of high ac, dc and impulse voltages in test laboratories, dry and wet tests, pollution test, corona and voltage distribution tests on insulators. With respect of this tests the measurement of insulation resistance, dielectric response analysis, recovery voltage, capacitance and tan , partial discharges, must be analyzed as well. This work assumes introduction to relevant national and international standards for above mentioned tests, which the technical project of HV laboratory should be based on.
Power generation using renewable power sources and preferably at point of demand is certainly way to satisfaction of ever-increasing need for the environmental protection. Nevertheless, operation of such power generation units leads to physical-technical-economical problems like hardly specifiable power supply reliability, huge time irregularity of the power supply for example under varying climatic conditions, generation of distorted voltages, etc. Thesis is focused on modeling and simulation of the following type power units: combustion engine-induction generator, wind turbine-induction generator, Photovoltaic generator-power inverter, etc. The simulation should be performed for their connection to a representative low and middle voltage power grid, with evaluation of their influence on the voltage characteristic for each power grid node. Cumulative effect of the distributed power units over the power grid is significant as well.
The thermal plasma is being widely technologically employed. One of the possible plasma sources is the plasma torch. It produces the plasma by means of axially blasted electrical arc. The aim of this work is to suggest mathematical-physical model of arc and to compare with simplified model. The values measured on plasma torch will be used for verification of the created model.
Tutor: Lázničková Ilona, doc. Ing., Ph.D.
This topic is focused on problem analysis of DC/DC converters with pulse transformers, with standard input voltage 300V or 600V (rectified net), output voltage 1kV-10kV and output power of several kW. Specific problems with construction of the secondary rectifier have to be solved. Further parasitic capacity of the output choke and transformation of secondary side parasitic capacity to the primary circuit represent another problems. Several power circuit topologies can be used to eliminate these problems. Modern switching semiconductors based on silicon-carbide (SiC) - diodes and transistors - enable to use topologies unaccepltable for earlier classical switching devices. High switching frequency can be achieved using these modern devices. This brings a dimension minimisation of transformers and chokes and further an elimination of the mentioned problems with parasitic capacities and with insulation problems. However the usage of fast SiC devices brings a necessity to solve new technical problems - transistor driving circuits, corresponding ringing problems etc. Available topologies with respect to the usage of SiC devices will be researched in the work theoretically and also practically.
Tutor: Vorel Pavel, doc. Ing., Ph.D.
The aim of the work is research in field of monitoring and satte evaluation of accumulatros foccused on the independent electric traction. The foccus will be held on modern lithium accumulators. The work will be oriented on finding of suitable models and their parammeters evaluation during accumulator lifetime and on methods of quantitative representatioan of accumulator state.
Tutor: Klíma Bohumil, doc. Ing., Ph.D.
Thesis is focused to nanotechnologies that are used in electromechanical systems, especially with the slide contact. Thesis will continue in extensive knowledge gained in this field of study.
The common method of fault calculation is based on condition that the generators and the lines are symmetrical. Real MV netwoks are not operated as transposed that means for sharp calculation there is not possible to suppose that they are symmetrical. The main aim of the work is the analysis of electrical values during different types of fault in non-symmetrical networks and evaluation of asymmetry influence on accuracy of calculation according standards.
The work is oriented to the design, creation and the experimental verification of numerical models for the harmonic and transient analysis of very high voltage electric fields. The aim is to create new numerical models for the stable and credible analysis of modeled fields and for the sensitivity analysis with respect to parameter changes. The results of the numerical analysis will be experimentally verified.
Tutor: Dědková Jarmila, prof. Ing., CSc.
Using high speed photography for an analysis and computational reconstruction of switching arc behavior in a switchgear under real conditions. Analysis of spectral filterring inflence on the switching arc digital image quality. Development of a software for high speed framing acquisition and subsequent digital image processing.
Tutor: Aubrecht Vladimír, prof. RNDr., CSc.
- transient phenomenon in power system, over voltage - over voltage level of switching when the no-load line
Tutor: Blažek Vladimír, doc. Ing., CSc.
The aim of the work is mapping of service characteristics of synchronous drives for electric traction.The topic includes optimization of the machine and control algorithms for these purposes.
The work will be focused on identification of static and dynamic parameters and linear and nonlinear mathematical models of special traction electrical machines with permanent magnets.
This topic is focused to the measurement of small distances and deformations of the rotating parts of electrical machines. This phenomenon effects machine operating conditions.
Topic is focused on the analysis of current and voltage system of a TN-type distribution network supplying star-connected asymmetrical nonlinear load. This case is typical for large majority of LV distribution networks with single-phase non-linear appliances. Under certain but usual conditions, described load-type connected to the three-phase network can cause overloading of the neutral conductor, leading in a worst case to its disconnection. High impedance of the neutral conductor together with the load unbalance i.a. leads to change in phase to neutral voltages magnitude up to the phase to phase voltage. Consequently, increased and at the same time decreased phase to neutral voltages can cause temporary or permanent change in function of the connected appliances. However, up to now there is no uniquely determined and effective tool to protect customer’s networks against the neutral conductor overloading and its disconnection. The aim of the thesis is on the base of the analysis to propose function principle of an appropriate protection and to realize its prototype. More information: drapela@feec.vutbr.cz.
Solution of energy balance in an arc plasma with respect to the radiative heat transfer. Influence of various spectral intervals and various molecular species on the radiative heat transfer in the arc plasma. Development of computer code for calculation of absorption coefficients of given thermal plasmas.
This topic is realted to the sliding contact issue in special electromechanical systems which is oprating in dynamic operating conditions with high nominal current, voltage, rotation speed, speed and defined environment parametres.
Main goal of the work is an research and development of special encapsulated motors both for water pumps powered by frequency converter. Special consideration will be especially dedicated to research within the meaning of magnetic circuit optimisation in magnetic losses point of view. The result of project solution should be a modern induction machine at high technical performance, which meets the customers requirements at maximum rate.
Theoretical analysis of all variants of switch mode supplies with the hard- and soft switching. The choice of most suitable variants, regarding to the technical feasibility. Theoretical description and modeling of power circuits and control cybernetic structures of switch mode supplies, regarding to the control quality. The circuit and construction design of the chosen types of switch mode supplies. Realization of the functional samples. Experimental verification of theoretical presumptions on realized functional samples. Comparison of theoretical, and experimental solutions.
Tutor: Patočka Miroslav, doc. Dr. Ing.
The theme is focused on problem of electrical system that is increasingly promoted as the managing electricity systems not only in commercial and industrial applications, but also family and residential development. It offers the possibility of using so-called intelligence system installation as a means not only to manage user processes and technologies in the internal functions of the object, but also for object management in terms of superior system which can be a distribution network.
Aims of the thesis: - Search documentation on exchange data formats - Specification of possibility CAD systems cooperation with external databases. - Usage analasys of parametrs at Inventor for items and component database creation. - The creating of Library centrum at Autodesk Inventor. - Specification of possibility CAD systems cooperation with Kinematics analysis
Tutor: Kuchyňková Hana, doc. Dr. Ing.